Revetment block



FIG. 1 is a perspective view of a revetment block according to my new design, the broken line showing of additional revetment blocks encased in a fabric sheet is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a left side elevational view thereof, the right side being a mirror image thereof;

FIG. 3 is a front side elevational view thereof, the back side elevational view being a mirror image thereof; and,

FIG. 4 is a top plan view thereof, the bottom plan view thereof. 

The ornamental design for a revetment block, as shown and described. 